[vsnet-grb-info 27524] Swift GRB 210308A: Global MASTER-Net observations report
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Tue Mar 9 07:19:00 JST 2021
TITLE: GCN CIRCULAR
NUMBER: 29627
SUBJECT: Swift GRB 210308A: Global MASTER-Net observations report
DATE: 21/03/08 22:18:11 GMT
FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov at xray.sai.msu.ru>
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin,
V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva,
D.Kuvshinov, D. Cheryasov
(Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile
(Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra
(The Instituto de Astrofisica de Canarias),
D. Buckley
(South African Astronomical Observatory),
O.A. Gres, N.M. Budnev, O.Ershova
(Irkutsk State University, API),
A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko
(Blagoveschensk Educational State University)
MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the Swift GRB 210308A ( V. D'Elia et al., GCN 29619) errorbox 40899 sec after notice time and 40918 sec after trigger time at 2021-03-08 17:59:54 UT, with upper limit up to 13.9 mag. Observations started at twilight. The observations began at zenith distance = 74 deg. The sun altitude is -12.2 deg.
MASTER-IAC robotic telescope located in Spain (IAC Teide Observatory) was pointed to the Swift GRB 210308A errorbox 55958 sec after notice time and 55976 sec after trigger time at 2021-03-08 22:10:53 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 48 deg. The sun altitude is -40.8 deg.
The galactic latitude b = -7 deg., longitude l = 164 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=1563625
We obtain a following upper limits.
Tmid-T0 | Site |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________
21950 | MASTER- | C | 60 | 18.0 |
22210 | MASTER- | C | 60 | 15.8 |
22945 | MASTER- | C | 60 | 12.6 |
41008 | MASTER-SAAO | C | 180 | 13.9 |
56067 | MASTER-IAC | C | 180 | 18.5 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
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